What is the cleanest lake near Lac Major?

Lac Baribeau in Matawinie County holds a Grade A water quality score and is 1.8 miles from Lac Major.

Why is Lac Major not Grade A?

Lac Major holds Grade B, with about 7.5 ft of water clarity and 10.7 µg/L of phosphorus. The grade reflects measured water quality against Metropolitan Council thresholds. Cleaner alternatives nearby score higher on clarity, phosphorus, or chlorophyll-a.

Are these recommendations based on real data?

Yes. Every grade is calculated from EPA Water Quality Portal samples for the lake. Recommendations are limited to lakes within 30 miles of Lac Major in Québec, with strictly higher numeric grade scores and sufficient monitoring data.

Cleaner Lakes Than Lac Major, Top 5 Within 30 Miles

Cleaner Lakes Than Lac Major

5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.

Lac Major carries a Grade B (Good) water quality score. Within 30 miles, 5 lakes hold a higher grade. Lac Baribeau (Matawinie County, Grade A, 1.8 mi away) is the closest meaningful upgrade.

Lac Baribeau

Matawinie County, Québec · 1.8 mi from Lac Major

+Higher grade (B → A)
++5.5 ft water clarity
+Lower phosphorus (5.3 vs 10.7 µg/L)

Lac du Pimbina

Matawinie County, Québec · 1.9 mi from Lac Major

+Higher grade (B → A)
++2.7 ft water clarity
+Lower phosphorus (5.4 vs 10.7 µg/L)

Lac Blanc

Matawinie County, Québec · 2.1 mi from Lac Major

+Higher grade (B → A)
++4.3 ft water clarity
+Lower phosphorus (4.5 vs 10.7 µg/L)

Lac Rochemaure

Matawinie County, Québec · 2.2 mi from Lac Major

+Higher grade (B → A)
++5.6 ft water clarity
+Lower phosphorus (3.7 vs 10.7 µg/L)

Lac Archambault

Matawinie County, Québec · 3.3 mi from Lac Major

+Higher grade (B → A)
++6 ft water clarity
+Lower phosphorus (3.8 vs 10.7 µg/L)

Reading the cohort

5 cleaner lakes sit within 30 miles of Lac Major in the EPA water-quality dataset. With that many higher-grade neighbors close by, Lac Major's Grade B reflects something specific to the lake itself — not a regional water-quality ceiling. The neighbor list below isn't a small set of marginal upgrades; it's a real cohort of meaningfully cleaner choices for the same Québec weekend.

The closest cleaner alternative — Lac Baribeau in Matawinie County, Grade A — sits 1.8 miles from Lac Major. At that distance, the substitution cost is essentially zero: same drive time, same regional access, demonstrably cleaner water on the EPA indicators. For repeat visitors who care about clarity or phosphorus levels, swapping the routine to Lac Baribeau is mostly a habit change rather than a logistics change.

The EPA water-quality grading combines clarity (Secchi depth), phosphorus, and chlorophyll-a measurements from state environmental sampling. A higher letter grade reflects measurably cleaner water on those indicators, not subjective beauty or access quality — a Grade A lake might have worse boat-launch facilities or shoreline access than a Grade C neighbor, so the ranking is one input alongside the rest of trip planning. See the methodology page for the full grading formula.

How this list is built

Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.